CN113632289B - Battery system, sampling method thereof, electronic device and readable storage medium - Google Patents
Battery system, sampling method thereof, electronic device and readable storage medium Download PDFInfo
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- CN113632289B CN113632289B CN202080022465.0A CN202080022465A CN113632289B CN 113632289 B CN113632289 B CN 113632289B CN 202080022465 A CN202080022465 A CN 202080022465A CN 113632289 B CN113632289 B CN 113632289B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a battery system, a sampling method thereof, an electronic device and a readable storage medium, wherein the sampling method comprises the following steps: obtaining the measurement voltage of the first single battery, wherein the measurement voltage is obtained by directly measuring the anode and the cathode of the first single battery; before a first equalizing unit corresponding to a first single battery is triggered and a first sampling loop corresponding to the first single battery is triggered, sampling the voltage of the first single battery to obtain a first sampling voltage; determining an equivalent resistance of a sampling chip based on the first sampling voltage and the measured voltage; starting an equalizing unit corresponding to at least two single batteries at intervals, and sampling the voltage of the first single battery in an equalizing state to obtain a second sampling voltage; and determining the current actual voltage of the first single battery based on the second sampling voltage and the equivalent resistance of the sampling chip. This application can make the monomer battery voltage of gathering not influenced by the equalizer circuit, can promote battery voltage sampling frequency.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a battery system, a sampling method of the battery system, an electronic device, and a readable storage medium.
Background
For a battery, the amount of electricity that can be discharged when discharging depends on the current minimum cell voltage; the amount of charge that can be charged during charging is dependent on the maximum cell voltage. The cell consistency is excellent at the initial packaging stage of the battery. However, the monomer consistency is worse and worse due to the aging of the core and other factors. Therefore, maintaining the uniformity of the unit cells has a great effect on the charge and discharge performance thereof. The main methods for maintaining consistency include active equalization, passive equalization, hybrid equalization, and the like. However, there is a drawback that when a cell performs an equalizing operation, sampling errors may occur in two adjacent cell strings and the current cell due to interference of an equalizing loop, and in order to ensure accuracy of sampling data, equalization may be turned off only during voltage acquisition, or voltage sampling may be turned off during equalization, resulting in a reduction in sampling frequency.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a battery system, a sampling method of the battery system, an electronic device and a readable storage medium, so that the collected voltage of a single battery is not affected by an equalizing loop, and the sampling frequency of the battery voltage can be further improved.
The embodiment of the application provides a battery system, the battery system includes a plurality of battery cells, a plurality of sampling units, a plurality of equalizing units, sampling chip and processing module, a plurality of battery cells form an electric connection path, a plurality of sampling units with the sampling chip constitutes a plurality of sampling loops, each battery cell corresponds one electric connection sampling loop and one equalizing unit, a plurality of first battery cells in the battery cells correspond one electric connection first sampling units in a plurality of sampling units and a plurality of first equalizing units in the equalizing unit, first sampling units with the sampling chip constitutes first sampling loops;
the processing module is used for acquiring a measured voltage of the first single battery, the sampling chip is used for sampling the voltage of the first single battery to obtain a first sampling voltage under the condition that the first equalizing unit is triggered and the first sampling loop is triggered, and the processing module is further used for determining an equivalent resistance of the sampling chip according to the first sampling voltage, the measured voltage and the equivalent resistance of the first sampling unit, wherein the measured voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of the first single battery;
the sampling chip is further used for sampling the voltage of the first single battery to obtain a second sampling voltage when the first equalizing unit is triggered and the first single battery enters an equalizing state, and the processing module is further used for determining the current actual voltage of the first single battery according to the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip and the equivalent resistance of the first equalizing unit.
According to some embodiments of the present application, the equivalent resistance of the first sampling unit includes an input equivalent resistance and a current-limiting equivalent resistance of a positive end branch, and an input equivalent resistance and a current-limiting equivalent resistance of a negative end branch, and the equivalent resistance of the sampling chip is determined by the following formula:
Rd＝Ud1*(2R1+2R2)/(Uref-Ud1)；
wherein R isdIs the equivalent resistance, U, of the sampling chiprefIs the measured voltage, U, of the first celld1Is the first sampling voltage, R1For said input equivalent resistance, R2Is the current limiting equivalent resistor.
According to some embodiments of the present application, the current actual voltage of the first cell is determined by the following formula:
U1＝Ud2/Rd*[(2R1+Rb)*(2R2+Rd)/Rb-2R1]；
wherein, U1Is the current actual voltage, U, of the first celld2Is the second sampling voltage, RbIs the equivalent resistance of the first equalizing unit.
According to some embodiments of the present application, the sampling chip further performs voltage sampling on the last cell adjacent to the first cell to obtain a third sampling voltage, and the processing module is further configured to determine the current actual voltage of the last cell adjacent to the first cell according to the third sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalizing unit, and the current actual voltage of the first cell.
According to some embodiments of the present application, the current actual voltage of the last cell adjacent to the first cell is determined by the following formula:
U0＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud3/Rd；
wherein, U0Is the current actual voltage of the last cell adjacent to the first cell, Ud3Is the third sampled voltage.
According to some embodiments of the present application, the sampling chip further performs voltage sampling on a next cell adjacent to the first cell to obtain a fourth sampling voltage, and the processing module is further configured to determine a current actual voltage of the next cell adjacent to the first cell according to the fourth sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalizing unit, and the current actual voltage of the first cell.
According to some embodiments of the present application, a current actual voltage of a next unit cell adjacent to the first unit cell is determined by the following formula:
U2＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud4/Rd；
wherein, U2Is the current actual voltage, U, of the next cell adjacent to the first celld4Is the fourth sampled voltage.
The embodiment of the present application further provides a sampling method of a battery system, the battery system includes a plurality of battery cells, a plurality of sampling units, a plurality of equalizing units and a sampling chip, it is a plurality of the battery cells form an electrical connection path, it is a plurality of the sampling units with a plurality of sampling loops are formed to the sampling chip, each the battery cell corresponds electrically to connect one sampling loop and one equalizing unit, it is a plurality of first battery cell in the battery cell corresponds electrically to connect a plurality of first sampling units and a plurality of in the sampling units first equalizing unit in the equalizing unit, first sampling unit with a first sampling loop is formed to the sampling chip, the method includes:
obtaining a measured voltage of the first single battery, wherein the measured voltage is obtained by directly measuring the anode and the cathode of the first single battery;
before the first equalizing unit is triggered and under the condition that the first sampling loop is triggered, voltage sampling is carried out on the first single battery to obtain a first sampling voltage;
determining an equivalent resistance of the sampling chip based on the first sampling voltage and the measured voltage;
starting an equalizing unit corresponding to at least two single batteries at intervals, and sampling the voltage of the first single battery in an equalizing state to obtain a second sampling voltage; and
and determining the current actual voltage of the first single battery based on the second sampling voltage and the equivalent resistance of the sampling chip.
According to some embodiments of the present application, the step of determining an equivalent resistance of the sampling chip based on the first sampling voltage and the measured voltage comprises:
and determining the equivalent resistance of the sampling chip based on the first sampling voltage, the measured voltage and the equivalent resistance of the first sampling unit.
According to some embodiments of the present application, the equivalent resistance of the first sampling unit includes an input equivalent resistance and a current-limiting equivalent resistance of a positive end branch, and an input equivalent resistance and a current-limiting equivalent resistance of a negative end branch, and the step of determining the equivalent resistance of the sampling chip includes:
determining the equivalent resistance of the sampling chip by utilizing a first preset formula;
wherein the first preset formula is as follows: r isd＝Ud1*(2R1+2R2)/(Uref-Ud1)，RdIs the equivalent resistance, U, of the sampling chiprefIs the measured voltage, U, of the first celld1Is the first sampling voltage, R1For said input equivalent resistance, R2Is the current limiting equivalent resistor.
According to some embodiments of the present application, the step of determining the current actual voltage of the first battery cell based on the second sampling voltage and the equivalent resistance of the sampling chip comprises:
and determining the current actual voltage of the first single battery based on the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip and the equivalent resistance of the first equalizing unit.
According to some embodiments of the present application, the step of determining the present actual voltage of the first unit cell comprises:
determining the current actual voltage of the first single battery by using a second preset formula;
wherein the second preset formula is as follows:
U1＝Ud2/Rd*[(2R1+Rb)*(2R2+Rd)/Rb-2R1]，U1is the current actual voltage, U, of the first celld2Is the second sampling voltage, RbIs the equivalent resistance of the first equalizing unit.
According to some embodiments of the application, the method further comprises:
sampling the voltage of the previous single battery adjacent to the first single battery to obtain a third sampling voltage; and
and determining the current actual voltage of the last single battery adjacent to the first single battery based on the third sampling voltage, the equivalent resistance of the sampling chip and the current actual voltage of the first single battery.
According to some embodiments of the present application, the step of determining the current actual voltage of the last cell adjacent to the first cell comprises:
determining the current actual voltage of the last single battery adjacent to the first single battery by using a third preset formula;
wherein the third preset formula is as follows:
U0＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud3/Rd，
U0is the current actual voltage of the last cell adjacent to the first cell, Ud3Is the third sampled voltage.
According to some embodiments of the application, the method further comprises:
sampling the voltage of the next single battery adjacent to the first single battery to obtain a fourth sampling voltage; and
and determining the current actual voltage of the next single battery adjacent to the first single battery based on the fourth sampling voltage, the equivalent resistance of the sampling chip and the current actual voltage of the first single battery.
According to some embodiments of the present application, the determining of the current actual voltage of the next cell adjacent to the first cell comprises:
determining the current actual voltage of the next single battery adjacent to the first single battery by using a fourth preset formula;
wherein the fourth preset formula is:
U2＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud4/Rd，
U2is the current actual voltage, U, of the next cell adjacent to the first celld4Is the fourth sampled voltage.
An embodiment of the present application further provides an electronic device, including:
the battery system comprises a plurality of sampling units, a plurality of equalizing units, a plurality of single batteries and a sampling chip; and
and the processor is used for executing the steps of the sampling method of the battery system.
The present disclosure also provides a readable storage medium, which stores computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the steps of the method for sampling a battery system described above.
According to the battery system, the sampling method of the battery system, the electronic device and the readable storage medium, the voltage of the single battery collected in the equalization stage is compensated, the collected voltage of the single battery is not affected by the equalization loop, and therefore the sampling frequency of the voltage of the battery can be improved.
Drawings
Fig. 1 is a schematic diagram of a battery system according to an embodiment of the present application.
Fig. 2 is an equivalent circuit diagram of a battery system according to an embodiment of the present application.
Fig. 3 is an equivalent circuit diagram of a sampling loop of a single battery when equalization is not turned on according to an embodiment of the present application.
Fig. 4 is an equivalent circuit diagram of a sampling loop when a target unit cell enters an equilibrium state according to an embodiment of the present application.
Fig. 5 is an equivalent circuit diagram of a sampling loop of a previous unit cell adjacent to a target unit cell when the target unit cell enters an equilibrium state according to an embodiment of the present disclosure.
Fig. 6 is an equivalent circuit diagram of a sampling loop of a next unit cell adjacent to a target unit cell when the target unit cell enters an equilibrium state according to an embodiment of the present disclosure.
Fig. 7 is a flowchart of a method of using a battery system according to an embodiment of the present application.
Fig. 8 is a schematic diagram of an architecture of an electronic device according to an embodiment of the present application.
Description of the main elements
Battery system 100
Electronic device 200
Processor 300
Computer program 400
Memory 500
Sampling units 10a, 10b, 10c
Equalizing units 20a, 20b, 20c
Single batteries 30a, 30b, 30c
Sampling chip 40
Processing module 50
The following detailed description will explain the present application in further detail in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an architecture of a battery system 100 according to an embodiment of the present disclosure.
The battery system 100 according to an embodiment of the present application includes a plurality of sampling units 10a to 10c (fig. 1 illustrates only three sampling units 10a, 10b, and 10c, and may be more than three or less than three), a plurality of equalizing units 20a to 20c (fig. 1 illustrates only three equalizing units 20a, 20b, and 20c, and may be more than three or less than three), a plurality of single batteries 30a to 30c (fig. 1 illustrates only three single batteries 30a, 30b, and 30c, and may be more than three or less than three), a sampling chip 40, and a processing module 50. Each of the sampling units 10a to 10c includes two sampling branches, and the plurality of single batteries 30a to 30c form an electrical connection path, for example, the plurality of single batteries 30 are connected in series, that is, when the positive electrode of the single battery 30b is electrically connected to the negative electrode of the single battery 30a, the negative electrode of the single battery 30b is electrically connected to the positive electrode of the single battery 30 c. The plurality of sampling units 10a to 10c and the sampling chip 40 may form a plurality of sampling loops to sample the plurality of single batteries 30a to 30 c. Each of the single batteries 30a to 30c may be electrically connected to a sampling loop and an equalizing unit 20a to 20c, for example, the single battery 30a corresponds to the sampling unit 10a and the equalizing unit 20a, the single battery 30b corresponds to the sampling unit 10b and the equalizing unit 20b, and the single battery 30c corresponds to the sampling unit 10c and the equalizing unit 20 c. Each of the balancing units 20a to 20c may bring the unit cells 30a to 30c electrically connected to it correspondingly into a passive balancing state. In other embodiments of the present application, each equalizing unit 20 may also cause the single batteries 30a to 30c electrically connected to the corresponding equalizing unit to enter an active equalizing state or a hybrid equalizing state.
In an embodiment of the present application, how many sampling units the sampling chip 40 can be combined with may be determined according to the number of sampling channels of the sampling chip 40. For example, if the number of sampling channels of the sampling chip 40 is 8, the sampling chip 40 may be combined with 8 sampling units to obtain 8 sampling loops, and further may perform voltage sampling on 8 single batteries, and if the battery system 100 includes 16 single batteries, at least 2 sampling chips 40 are required. The sampling chip 40 can be matched with 8 sampling units by a time-sharing sampling working mode, and voltage sampling is carried out on 8 single batteries.
In an embodiment of the present invention, the sampling units 10a to 10c and the equalizing units 20a to 20c may be designed by using a conventional circuit scheme, which is not limited herein. The sampling units 10a to 10c may have the same circuit configuration therebetween, and the equalizing units 20a to 20c may have the same circuit configuration therebetween. The unit cells 30a to 30c may be lithium ion batteries, lithium polymer batteries, or the like. The sampling chip 40 may be an Analog Front End (AFE) chip. The Processing module 50 may be a device with computing Processing capability, such as a System On Chip (System On Chip), a Central Processing Unit (CPU), an arm (advanced riscmarchitecture) processor, a Field Programmable Gate Array (FPGA), a special purpose processor, and the like.
In the embodiment of the present application, the single cell 30a is taken as an example for illustration. At the stage of directly measuring the actual voltage of the single battery 30a, for example, before packaging into a battery pack, an external voltage measuring device (such as a voltmeter, a voltage measuring instrument, etc.) or a measuring circuit may be directly used to measure the actual voltage of the single battery 30 a.
For example, before packaging into a battery pack, an external voltage measurement device is used to measure the actual voltage of the single battery 30a, where the measured voltage measured by the external voltage measurement device is the actual voltage of the single battery 30a, and when two probes of a voltmeter or a voltage measuring instrument are connected to the positive electrode and the negative electrode of the single battery 30a, respectively, the measured voltage of the single battery 30a (i.e., the actual voltage of the single battery 30 a) can be obtained. After the plurality of unit batteries 30a to 30c are packaged into the battery pack, since the probe cannot be directly connected to the positive electrode and the negative electrode of the unit batteries, the voltage of each unit battery 30a to 30c cannot be directly measured by using an external voltage measuring device.
In one embodiment of the present application, the processing module 50 can obtain the measured voltage of the single battery 30 a. For example, after the measured voltage of the battery cell 30a measured by the external voltage measuring device is used, the measured voltage may be stored in a memory, and the processing module 50 may communicate with the memory to obtain the measured voltage of the battery cell 30 a.
When the measured voltage of the single battery 30a is obtained, the voltage of the single battery 30a may be collected by a sampling loop corresponding to the single battery 30a and compared with the measured voltage of the single battery 30a, so as to determine the equivalent resistance of the sampling chip 40. Specifically, before the equalizing unit 20a corresponding to the single battery 30a is triggered, and the sampling loop corresponding to the single battery 30a is triggered, and a voltage measurement is performed on the single battery 30a to obtain a measurement voltage, the sampling chip 40 performs voltage sampling on the single battery 30a to obtain a first sampling voltage, and the processing module 50 may determine the equivalent resistance of the sampling chip 40 according to the first sampling voltage, the measurement voltage of the single battery 30a, and the equivalent resistance of the sampling unit 10 a. The sampling loop being triggered may refer to the sampling channel of the sampling chip 40 corresponding to the sampling loop being triggered (the sampling channel enters a sampling operation mode).
In an embodiment of the present application, when the equalizing loop of the single battery 30a is opened, a deviation may occur between the voltage sampled by the single battery 30a and the voltage sampled by the single battery 30b and the actual cell voltage. When the equalizing loop of the single battery 30b is started, the voltages sampled by the single batteries 30a, 30b, and 30c may deviate from the actual cell voltages. When the equalization loop of the single battery 30c is started, the voltage sampled by the single battery 30b and the single battery 30c may deviate from the actual cell voltage.
The processing module 50 may obtain the current actual voltages of the single batteries 30a to 30c in the following manner, so as to prevent the acquired voltages of the single batteries 30a to 30c from being affected by the equalizing loop. Specifically, equalization module 20b is triggered when one of the equalization modules 20 a-20 c is triggered, for example. The equalizing module 20b enters an equalizing state corresponding to the electrically connected single battery 30b, the sampling chip 40 further performs voltage sampling on the single battery 30b to obtain a second sampling voltage, and the processing module 50 may determine the current actual voltage of the single battery 30b according to the second sampling voltage, the equivalent resistance of the sampling unit 10b, the equivalent resistance of the sampling chip 40, and the equivalent resistance of the equalizing unit 20 b.
It will be appreciated that equalization module 20c is triggered. The equalizing module 20c enters an equalizing state corresponding to the single battery 30c, the sampling chip 40 further samples the voltage of the single battery 30c to obtain a sampling voltage, and the processing module 50 may determine the current actual voltage of the single battery 30c according to the sampling voltage, the equivalent resistance of the sampling unit 10c, the equivalent resistance of the sampling chip 40, and the equivalent resistance of the equalizing unit 20 c.
Fig. 2 is a schematic diagram of an equivalent circuit of the battery system 100 according to an embodiment of the present disclosure.
In an embodiment of the present application, three single batteries 30a, 30b, and 30c are exemplified, in which each sampling unit 10a to 10c has the same circuit structure, and each equalizing unit 20a to 20c has the same circuit structure. The BAT1 terminal is the positive electrode of the unit battery 30a, the BAT2 terminal is the negative electrode of the unit battery 30a and the positive electrode of the unit battery 30b, the BAT3 terminal is the negative electrode of the unit battery 30b and the positive electrode of the unit battery 30c, and the BAT4 terminal is the negative electrode of the unit battery 30 c. The sampling branch circuits of the BAT1 terminal, the BAT2 terminal, the BAT3 terminal and the BAT4 terminal all comprise input equivalent resistors R1Equivalent resistance R with current limiting2That is, the sampling unit 10a is equivalent to the input equivalent resistance R at the terminal BAT11Current limiting equivalent resistor R2And input equivalent resistance R of BAT2 terminal1Current limiting equivalent resistor R2The sampling unit 10b is equivalent to an input equivalent resistor R at the terminal BAT21Current limiting equivalent resistor R2And input equivalent resistance R of BAT3 terminal1Current limiting equivalent resistor R2The sampling unit 10c is equivalent to an input equivalent resistance R at the terminal BAT31Current limiting equivalent resistor R2And input equivalent resistance R of BAT4 terminal1Current limiting equivalent resistor R2。
Resistance RdCell is the equivalent resistance of the sampling chip 40, i.e. the equivalent resistance of the internal sampling loop and the analog-to-digital converter of the sampling chip 401A sampling point for sampling the voltage at the BAT1 terminal by the sampling chip 40, a sampling point Cell2Is a sampling point of the voltage at the BAT2 end sampled by the sampling chip 40, the sampling point is Cell3Is a sampling point of the voltage at the BAT3 end sampled by the sampling chip 40, the sampling point is Cell4Is the sampling point at which the sampling chip 40 samples the voltage at terminal BAT 4.
Input equivalent resistance R of BAT1 terminal1Current limiting equivalent resistor R2And the equivalent resistance R of the sampling chip 40dAnd input equivalent resistance R of BAT2 terminal1Current limiting equivalent resistor R2A first sampling loop is formed to realize voltage sampling of the single battery 30a, and an input equivalent resistance R at the BAT2 end1Current limiting equivalent resistor R2And the equivalent resistance R of the sampling chip 40dAnd input equivalent resistance R at terminal BAT31Current limiting equivalent resistor R2A second sampling loop is formed to realize voltage sampling of the single battery 30b, and an input equivalent resistor R at the BAT3 end1Current limiting equivalent resistor R2And the equivalent resistance R of the sampling chip 40dAnd input equivalent resistance R of BAT4 terminal1Current limiting equivalent resistor R2And a third sampling loop is formed to realize voltage sampling of the single battery 30 c. Each of the equalizing units 20 a-20 c is equivalently represented by a resistor RbAnd a controllable switch S1. When the controllable switch S1 is closed, it represents that the current balancing unit is turned on, and the single battery correspondingly and electrically connected with the current balancing unit enters a passive balancing state.
In other embodiments of the present application, each of the sampling units 10a to 10c may have a different circuit configuration, and each of the equalizing units 20a to 20c may have a different circuit configuration.
As shown in fig. 3, taking the single battery 30a as an example, in the stage of directly measuring the actual voltage of the single battery 30a, the equivalent resistance R of the sampling chip 40 can be determined by collecting the voltage of the single battery 30a and comparing the voltage with the measured voltage of the single battery 30ad. For example, the equivalent resistance R of the sampling chip 40 may be determined before the battery system 100 is shipped (without being packaged into a battery pack) in this mannerd. In FIG. 3, let the current of the sampling loop be I1The measured voltage of the battery cell 30a is UrefSampling chip 40 pairs sampling points Cell1、Cell2Sampling to obtain a first sampling voltage Ud1Further, the following two equations can be constructed:
Uref＝I1*(2R1+2R2+Rd)--i；
Ud1＝I1*Rd--ii；
the equivalent resistance R of the sampling chip 40 can be obtained by solving the above equations i and iidAs shown in equation iii:
Rd＝Ud1*(2R1+2R2)/(Uref-Ud1)--iii；
due to the parameter U in the above formula iiid1、R1、R2、UrefAll have known parameter values, and the equivalent resistance R of the sampling chip 40 can be determined according to the formula iiidThe resistance value of (2).
As shown in fig. 4, taking the single battery 30b as an example, the equalizing unit 20b is turned on, the single battery 30b enters a passive equalizing state, and the current actual voltage of the single battery 30b may be determined through the second sampling voltage of the single battery 30b acquired by the sampling chip 40, the equivalent resistance of the sampling unit 10b, the equivalent resistance of the sampling chip 40, and the equivalent resistance of the equalizing unit 20 b. In FIG. 4, let the input equivalent resistance R flowing through BAT2 terminal1Has a current of I1Current limiting equivalent resistor R flowing through BAT2 terminal2Has a current of I3An equivalent resistance R flowing through the equalizing unit 20bbHas a current of I2The current actual voltage of the battery cell 30b is U1Sampling chip 40 pairs sampling points Cell2、Cell3Sampling to obtain a second sampling voltage Ud2Based on mesh amperometry, the following four equations may be constructed:
I1＝I2+I3--i；
I3＝Ud2/Rd--ii；
-I2*Rb＝I3*(2R2+Rd)--iii；
-U1＝I1*R1+I2*Rb+(I3+I2)*R1--iv；
the current actual voltage of the single battery 30b is U which can be obtained by the above formulas i to iv1As shown in formula v:
U1＝Ud2/Rd*[(2R1+Rb)*(2R2+Rd)/Rb-2R1]--v；
due to the parameter U in the above formula vd2、R1、R2、Rb、RdAll have known parameter values, and the current actual voltage U of the single battery 30b can be determined according to the formula v1I.e. the compensated sampled voltage of the single battery 30 b.
As shown in fig. 5, also taking the case that the equalizing unit 20b is turned on and the single battery 30b enters the passive equalizing state as an example, the current actual voltage of the single battery 30a can be determined through the third sampling voltage of the last single battery 30a adjacent to the single battery 30b, which is acquired by the sampling chip 40, the equivalent resistance of the sampling unit 10a, the equivalent resistance of the sampling chip 40, the equivalent resistance of the equalizing unit 20b, and the current actual voltage of the single battery 30 b. In fig. 5, the input equivalent resistance R flowing through terminal BAT2 is set1Has a current of I1An equivalent resistance R flowing through the equalizing unit 20bbHas a current of I2Input equivalent resistance R flowing through BAT1 terminal1Has a current of I3The current actual voltage of the unit battery 30a is U0The current actual voltage of the battery cell 30b is U1Sampling chip 40 pairs sampling points Cell1、Cell2Sampling to obtain a third sampling voltage Ud3Based on mesh amperometry, the following four equations may be constructed:
I1＝I2-I3--i；
I3＝Ud3/Rd--ii；
-U0＝I3*(R1+2R2+Rd)-I1*R1--iii；
-U1＝I1*R1+I2*(Rb+R1)--iv；
the current actual voltage of the single battery 30a is U, which can be obtained by the above equations i to iv0As shown in equation v:
U0＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud3/Rd--v；
due to the parameter U in the above formula vd3、U1、R1、R2、Rb、RdAll have known parameter values, and the current actual voltage U of the single battery 30a can be determined according to the formula v0I.e. the compensated sampled voltage of the single battery 30 a.
As shown in fig. 6, also taking the case that the equalizing unit 20b is turned on and the single battery 30b enters the passive equalizing state as an example, the current actual voltage of the single battery 30c may be determined by the fourth sampling voltage of the next single battery 30c adjacent to the single battery 30b, which is collected by the sampling chip 40, the equivalent resistance of the sampling unit 10c, the equivalent resistance of the sampling chip 40, the equivalent resistance of the equalizing unit 20b, and the current actual voltage of the single battery 30 b. In fig. 6, let the equivalent resistance R flowing through the equalizing unit 20bbHas a current of I1Input equivalent resistance R flowing through BAT3 terminal1Has a current of I2Current limiting equivalent resistor R flowing through BAT3 terminal2Has a current of I3The current actual voltage of the battery cell 30c is U2The current actual voltage of the battery cell 30b is U1Sampling chip 40 pairs sampling points Cell3、Cell4Sampling to obtain a fourth sampling voltage Ud4Based on mesh amperometry, the following four equations may be constructed:
I1＝I2+I3--i；
I3＝Ud4/Rd--ii；
-U1＝I1*(Rb+R1)+I2*R1--iii；
-U2＝I2*R1+I3*(R1+2R2+Rd)--iv；
the current actual voltage of the single battery 30c is U which can be obtained by the above formulas i to iv2As shown in equation v:
U2＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud4/Rd--v；
due to the parameter U in the above formula vd4、U1、R1、R2、Rb、RdAll have known parameter values, and the current actual voltage U of the single battery 30c can be determined according to the formula v2I.e. the compensated sampled voltage of the single battery 30 c.
According to the technical scheme, the voltage sampling of the single battery can be still carried out to obtain accurate sampling voltage in the process of equalizing the battery system 100, so that the voltage of the single battery is not affected by an equalizing loop, and the defect that the sampling frequency is reduced because the battery voltage sampling needs to be stopped in the battery equalizing stage in the prior art is overcome.
Referring to fig. 7, fig. 7 is a flowchart illustrating a sampling method of a battery system according to an embodiment of the present disclosure. The sampling method of the battery system may include the steps of:
step S71: the measured voltage of a single battery is obtained.
In an embodiment of the present application, the measured voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of a single battery, for example, the measured voltage can be obtained by directly measuring the positive electrode and the negative electrode of the single battery by using an external voltage measuring device.
Step S72: and before the balancing unit corresponding to the single battery is triggered, sampling the voltage of the single battery to obtain a first sampling voltage.
In an embodiment of the present application, as shown in fig. 3, taking the single battery as the single battery 30a as an example, before the equalizing unit 20a corresponding to the single battery 30a is triggered and the sampling loop corresponding to the single battery 30a is triggered, the sampling chip 40 may be used to collect the voltage of the single battery 30a, that is, the sampling chip 40 is used to sample the voltage of the single battery 30aPoint Cell1、Cell2And sampling to obtain the first sampling voltage. It is understood that, in other embodiments of the present application, the voltage of the single battery 30b may also be collected by the sampling chip 40 when the actual voltage of the single battery 30b can be directly measured, that is, the sampling chip 40 is used to sample the sampling point Cell2、Cell3And sampling to obtain the first sampling voltage.
Step S73: the equivalent resistance of the sampling chip 40 is determined based on the first sampling voltage and the measured voltage of the battery cell 30 a.
In one embodiment of the present application, as shown in fig. 3, the current of the sampling loop is I1The measured voltage of the battery cell 30a is UrefSampling chip 40 pairs sampling points Cell1、Cell2Sampling to obtain a first sampling voltage Ud1Further, the following two equations can be constructed:
Uref＝I1*(2R1+2R2+Rd)--i；
Ud1＝I1*Rd--ii；
the equivalent resistance R of the sampling chip 40 can be obtained by solving the above equations i and iidAs shown in equation iii:
Rd＝Ud1*(2R1+2R2)/(Uref-Ud1)--iii；
due to the parameter U in the above formula iiid1、R1、R2、UrefAll have known parameter values, and the equivalent resistance R of the sampling chip 40 can be determined according to the formula iiidThe resistance value of (2).
It is understood that if the actual voltage of the single battery 30b can be directly measured, the sampling chip 40 can also measure the sampling point Cell2、Cell3Sampling to obtain a sampling voltage, and adopting the above calculation principle based on the sampling point Cell2、Cell3Between the sampled voltage and the measured voltage U of the single battery 30brefDetermining the equivalent resistance R of the sampling chip 40d. If the actual power of the unit cell 30cThe pressure can be directly measured, and the sampling chip 40 can also measure the Cell sampling point3、Cell4Sampling to obtain a sampling voltage, and calculating based on the sampling point Cell by adopting the above calculation principle3、Cell4Between the sampling voltage and the measured voltage U of the single battery 30crefDetermining the equivalent resistance R of the sampling chip 40d。
Step S74: and starting the balancing units corresponding to at least two single batteries at intervals, and sampling the voltage of one single battery in a balanced state to obtain a second sampling voltage.
In an embodiment of the present application, an equalizing loop of a single battery may cause a previous single battery adjacent to the single battery to deviate from an actual battery voltage, and a next single battery adjacent to the single battery to deviate from the actual battery voltage. This application is through when a battery cell gets into passive equilibrium state, calculate this battery cell's actual voltage, calculate the last battery cell's that is adjacent with this battery cell actual voltage, and calculate the next battery cell's that is adjacent with this battery cell actual voltage, and then can be through opening the equalizing unit that every interval two at least battery cells correspond, promptly to a plurality of battery cell 30a ~ 30c carry out every interval two at least battery cell and open the equilibrium.
Taking the single battery as the single battery 30b as an example, the equalizing unit 20b is turned on, and the single battery 30b enters a passive equalizing state. The sampling chip 40 may be used to sample the voltage of the single battery 30b in the equilibrium state to obtain a second sampling voltage, that is, when the single battery 30b enters the passive equilibrium state, the sampling chip 40 may be used to sample the sampling point Cell2、Cell3Sampling is carried out to obtain two sampling voltages. Step S75: the current actual voltage of the one unit battery 30b is determined based on the second sampling voltage and the equivalent resistance of the sampling chip 40.
In one embodiment of the present application, when obtaining the equivalent resistance of the sampling chip 40 and the second sampling voltage of the single battery 30b in the equilibrium state, the second sampling voltage and the sampling chip 4 may be based onThe equivalent resistance of 0 determines the current actual voltage of the unit battery 30 b. As shown in FIG. 4, let the input equivalent resistance R flowing through BAT2 terminal1Has a current of I1Current limiting equivalent resistor R flowing through BAT2 terminal2Has a current of I3An equivalent resistance R flowing through the equalizing unit 20bbHas a current of I2The current actual voltage of the battery cell 30b is U1The sampling chip 40 is used for sampling the sampling point Cell2、Cell3Sampling to obtain the second sampling voltage of Ud2Based on mesh amperometry, the following four equations may be constructed:
I1＝I2+I3--i；
I3＝Ud2/Rd--ii；
-I2*Rb＝I3*(2R2+Rd)--iii；
-U1＝I1*R1+I2*Rb+(I3+I2)*R1--iv；
the current actual voltage of the single battery 30b is U which can be obtained by the above formulas i to iv1As shown in equation v:
U1＝Ud2/Rd*[(2R1+Rb)*(2R2+Rd)/Rb-2R1]--v；
due to the parameter U in the above formula vd2、R1、R2、Rb、RdAll have known parameter values, and the current actual voltage U of the single battery 30b can be determined according to the formula v1I.e. the compensated sampled voltage of the single battery 30 b.
Step S76: and sampling the voltage of the previous single battery 30a adjacent to the single battery 30b to obtain a third sampled voltage.
In an embodiment of the present application, when the single battery 30b enters the passive equalization state, the sampling chip 40 may also be used to sample the voltage of the previous single battery 30a adjacent to the single battery 30b to obtain a third sampled voltage, that is, when the previous single battery 30a is in the passive equalization stateWhen the single battery 30b enters the passive equilibrium state, the sampling chip 40 can be used to sample the sampling point Cell1、Cell2Sampling is carried out to obtain three sampling voltages.
Step S77: and determining the current actual voltage of the last single battery 30a adjacent to the single battery 30b based on the third sampling voltage, the equivalent resistance of the sampling chip 40 and the current actual voltage of the single battery 30 b.
In an embodiment of the present application, when obtaining the equivalent resistance of the sampling chip 40, the current actual voltage of the single battery 30b in the balanced state, and the third sampling voltage of the single battery 30a, the current actual voltage of the previous single battery 30a adjacent to the single battery 30b may be determined based on the third sampling voltage, the equivalent resistance of the sampling chip 40, and the current actual voltage of the single battery 30 b. As shown in FIG. 5, let the input equivalent resistance R flowing through terminal BAT21Has a current of I1An equivalent resistance R flowing through the equalizing unit 20bbHas a current of I2Input equivalent resistance R flowing through terminal BAT11Has a current of I3The current actual voltage of the battery cell 30a is U0The current actual voltage of the battery cell 30b is U1Sampling chip 40 pairs sampling points Cell1、Cell2Sampling to obtain a third sampling voltage Ud3Based on mesh amperometry, the following four equations may be constructed:
I1＝I2-I3--i；
I3＝Ud3/Rd--ii；
-U0＝I3*(R1+2R2+Rd)-I1*R1--iii；
-U1＝I1*R1+I2*(Rb+R1)--iv；
the current actual voltage of the single battery 30a is U which can be solved by the above formulas i to iv0As shown in equation v:
U0＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud3/Rd--v；
due to the parameter U in the above formula vd3、U1、R1、R2、Rb、RdAll have known parameter values, and the current actual voltage U of the single battery 30a can be determined according to the formula v0I.e. the compensated sampled voltage of the single battery 30 a.
Step S78: the next unit cell 30c adjacent to the one unit cell 30b is voltage-sampled to obtain a fourth sampled voltage.
In an embodiment of the present application, when the single battery 30b enters the passive equilibrium state, the sampling chip 40 can also be used to sample the voltage of the next single battery 30c adjacent to the single battery 30b to obtain the fourth sampling voltage, that is, when the single battery 30b enters the passive equilibrium state, the sampling chip 40 can be used to sample the sampling point Cell3、Cell4And sampling to obtain four sampling voltages.
Step S79: and determining the current actual voltage of the next single battery 30c adjacent to the single battery 30b based on the fourth sampling voltage, the equivalent resistance of the sampling chip 40 and the current actual voltage of the single battery 30 b.
In an embodiment of the present application, when obtaining the equivalent resistance of the sampling chip 40, the current actual voltage of the single battery 30b in the balanced state, and the fourth sampling voltage of the single battery 30c, the current actual voltage of the next single battery 30c adjacent to the single battery 30b may be determined based on the fourth sampling voltage, the equivalent resistance of the sampling chip 40, and the current actual voltage of the single battery 30 b. As shown in FIG. 6, let the equivalent resistance R flowing through the equalizing unit 20bbHas a current of I1Input equivalent resistance R flowing through BAT3 terminal1Has a current of I2Current limiting equivalent resistor R flowing through terminal BAT32Has a current of I3The current actual voltage of the battery cell 30c is U2The current actual voltage of the battery cell 30b is U1Sampling chip 40 pairs sampling points Cell3、Cell4Sampling to obtain a fourth sampling voltage Ud4Based on mesh amperometry, the following four equations may be constructed:
I1＝I2+I3--i；
I3＝Ud4/Rd--ii；
-U1＝I1*(Rb+R1)+I2*R1--iii；
-U2＝I2*R1+I3*(R1+2R2+Rd)--iv；
the current actual voltage of the single battery 30c is U which can be obtained by the above formulas i to iv2As shown in equation v:
U2＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud4/Rd--v；
due to the parameter U in the above formula vd4、U1、R1、R2、Rb、RdAll have known parameter values, and the current actual voltage U of the battery cell 30c can be determined according to the formula v2I.e. the compensated sampled voltage of the single battery 30 c.
Referring to fig. 8, fig. 8 is a schematic configuration diagram of an electronic device 200 according to an embodiment of the present disclosure.
The electronic device 200 includes, but is not limited to, at least one processor 300 and a battery system 100, and the above elements may be connected via a bus or directly.
In an embodiment of the present application, the at least one processor 300 is a device having a computing capability, such as a System On Chip (System On Chip), a Central Processing Unit (CPU), an arm (advanced riscmarchitecture) processor, a Field Programmable Gate Array (FPGA), or a dedicated processor. The sampling method is implemented when the processor 300 executes a computer program 400 stored in a memory comprised by the electronic device 200. Alternatively, the memory of the electronic device 200 stores a computer instruction, and when the processor 300 of the electronic device 200 executes the computer instruction, the electronic device 200 or the processor 300 executes the sampling method.
It should be noted that fig. 1 is only an example of the electronic device 200. In other embodiments, the electronic device 200 may also include more elements or have a different configuration of elements. The electronic device 200 may be an electric motorcycle, an electric bicycle, an electric power tool, an electric automobile, a drone, a mobile phone, a tablet computer, a personal digital assistant, a personal computer, or any other suitable rechargeable device.
In an embodiment of the present application, the computer program 400 may be divided into one or more modules (not shown), and the one or more modules may be stored in the processor 300, and the processor 300 may execute the sampling method according to the embodiment of the present application. The one or more modules may be a series of computer program instruction segments capable of performing certain functions, the instruction segments being used to describe the execution of the computer program 400 in the electronic device 200.
The modules in the computer program 400, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the methods described above can be realized. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
In an embodiment of the present application, the electronic device 200 may further include a memory 500, and the one or more modules may be further stored in the memory 500 and executed by the processor 300. The memory 500 may be an internal memory of the electronic device 200, i.e., a memory built in the electronic device 200. In other embodiments, the memory 500 may also be an external memory of the electronic device 200, i.e., a memory externally connected to the electronic device 200.
In one embodiment of the present application, the memory 500 is used for storing program codes and various data, for example, program codes of the computer program 400 installed in the electronic device 200, and realizes that the access of the program or the data is automatically completed during the operation of the electronic device 200.
The memory 500 may include random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other non-volatile solid state storage device.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not used as limitations of the present application, and that suitable modifications and changes of the above embodiments are within the scope of the claims of the present application as long as they are within the spirit and scope of the present application.
Claims (18)
1. A battery system is characterized by comprising a plurality of single batteries, a plurality of sampling units, a plurality of equalizing units, a sampling chip and a processing module, wherein the single batteries form an electric connection path, the sampling units and the sampling chip form a plurality of sampling loops, each single battery is correspondingly and electrically connected with one sampling loop and one equalizing unit, a first single battery in the single batteries is correspondingly and electrically connected with a first sampling unit in the sampling units and a first equalizing unit in the equalizing units, and the first sampling unit and the sampling chip form a first sampling loop;
the processing module is used for acquiring a measured voltage of the first single battery, the sampling chip is used for sampling the voltage of the first single battery to obtain a first sampling voltage under the condition that the first equalizing unit is triggered and the first sampling loop is triggered, and the processing module is further used for determining an equivalent resistance of the sampling chip according to the first sampling voltage, the measured voltage and the equivalent resistance of the first sampling unit, wherein the measured voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of the first single battery;
the sampling chip is further used for sampling the voltage of the first single battery to obtain a second sampling voltage when the first equalizing unit is triggered and the first single battery enters an equalizing state, and the processing module is further used for determining the current actual voltage of the first single battery according to the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip and the equivalent resistance of the first equalizing unit.
2. The battery system according to claim 1, wherein the equivalent resistance of the first sampling unit includes an input equivalent resistance and a current-limiting equivalent resistance of the positive-end branch, and an input equivalent resistance and a current-limiting equivalent resistance of the negative-end branch, and the equivalent resistance of the sampling chip is determined by the following formula:
Rd＝Ud1*(2R1+2R2)/(Uref-Ud1)；
wherein R isdIs the equivalent resistance, U, of the sampling chiprefIs the measured voltage, U, of the first celld1Is the first sampling voltage, R1For said input equivalent resistance, R2Is the current limiting equivalent resistor.
3. The battery system of claim 2, wherein the current actual voltage of the first cell is determined by the following equation:
U1＝Ud2/Rd*[(2R1+Rb)*(2R2+Rd)/Rb-2R1]；
wherein, U1Is the current actual voltage, U, of the first celld2Is the second sampling voltage, RbIs the equivalent resistance of the first equalizing unit.
4. The battery system of claim 3, wherein the sampling chip further samples a voltage of a previous battery cell adjacent to the first battery cell to obtain a third sampled voltage, and the processing module is further configured to determine a current actual voltage of the previous battery cell adjacent to the first battery cell according to the third sampled voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalizing unit, and the current actual voltage of the first battery cell.
5. The battery system of claim 4, wherein a current actual voltage of a last cell adjacent to the first cell is determined by the following equation:
U0＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud3/Rd；
wherein, U0For the current actual voltage, U, of the last cell adjacent to the first celld3Is the third sampled voltage.
6. The battery system of claim 3, wherein the sampling chip further samples a voltage of a next battery cell adjacent to the first battery cell to obtain a fourth sampled voltage, and the processing module is further configured to determine a current actual voltage of the next battery cell adjacent to the first battery cell according to the fourth sampled voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalizing unit, and the current actual voltage of the first battery cell.
7. The battery system of claim 6, wherein a current actual voltage of a next cell adjacent to the first cell is determined by the following equation:
U2＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud4/Rd；
wherein, U2Is the current actual voltage, U, of the next cell adjacent to the first celld4Is the fourth sampled voltage.
8. A sampling method of a battery system, wherein the battery system comprises a plurality of single batteries, a plurality of sampling units, a plurality of equalizing units and a sampling chip, the single batteries form an electrical connection path, the sampling units and the sampling chip form a plurality of sampling loops, each single battery is electrically connected with one corresponding sampling loop and one corresponding equalizing unit, a first single battery in the single batteries is electrically connected with a first sampling unit in the sampling units and a first equalizing unit in the equalizing units, and the first sampling unit and the sampling chip form a first sampling loop, the method comprises the following steps:
obtaining a measured voltage of the first single battery, wherein the measured voltage is obtained by directly measuring the anode and the cathode of the first single battery;
before the first equalizing unit is triggered and under the condition that the first sampling loop is triggered, voltage sampling is carried out on the first single battery to obtain first sampling voltage;
determining the equivalent resistance of the sampling chip based on the first sampling voltage and the measured voltage;
starting the balancing units corresponding to at least two single batteries at each interval, and sampling the voltage of the first single battery in a balanced state to obtain a second sampling voltage; and
and determining the current actual voltage of the first single battery based on the second sampling voltage and the equivalent resistance of the sampling chip.
9. The sampling method of claim 8, wherein the step of determining an equivalent resistance of the sampling chip based on the first sampled voltage and the measured voltage comprises:
and determining the equivalent resistance of the sampling chip based on the first sampling voltage, the measured voltage and the equivalent resistance of the first sampling unit.
10. The sampling method according to claim 9, wherein the equivalent resistance of the first sampling unit includes an input equivalent resistance and a current-limiting equivalent resistance of a positive-side branch, and an input equivalent resistance and a current-limiting equivalent resistance of a negative-side branch, and the step of determining the equivalent resistance of the sampling chip includes:
determining the equivalent resistance of the sampling chip by utilizing a first preset formula;
wherein the firstThe preset formula is as follows: rd＝Ud1*(2R1+2R2)/(Uref-Ud1)，RdIs the equivalent resistance, U, of the sampling chiprefIs the measured voltage, U, of the first celld1Is the first sampling voltage, R1For said input equivalent resistance, R2Is the current limiting equivalent resistor.
11. The sampling method of claim 10, wherein the step of determining the current actual voltage of the first cell based on the second sampled voltage and the equivalent resistance of the sampling chip comprises:
and determining the current actual voltage of the first single battery based on the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip and the equivalent resistance of the first equalizing unit.
12. The sampling method of claim 11, wherein the step of determining the current actual voltage of the first cell comprises:
determining the current actual voltage of the first single battery by using a second preset formula;
wherein the second preset formula is as follows:
U1＝Ud2/Rd*[(2R1+Rb)*(2R2+Rd)/Rb-2R1]，U1is the current actual voltage, U, of the first celld2Is the second sampling voltage, RbIs the equivalent resistance of the first equalizing unit.
13. The sampling method of claim 12, wherein the method further comprises:
sampling the voltage of the previous single battery adjacent to the first single battery to obtain a third sampling voltage; and
and determining the current actual voltage of the last single battery adjacent to the first single battery based on the third sampling voltage, the equivalent resistance of the sampling chip and the current actual voltage of the first single battery.
14. The sampling method of claim 13, wherein the step of determining a current actual voltage of a last cell adjacent to the first cell comprises:
determining the current actual voltage of the last single battery adjacent to the first single battery by using a third preset formula;
wherein the third preset formula is:
U0＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud3/Rd，U0is the current actual voltage of the last cell adjacent to the first cell, Ud3Is the third sampled voltage.
15. The sampling method of claim 12, wherein the method further comprises:
sampling the voltage of the next single battery adjacent to the first single battery to obtain a fourth sampling voltage; and
and determining the current actual voltage of the next single battery adjacent to the first single battery based on the fourth sampling voltage, the equivalent resistance of the sampling chip and the current actual voltage of the first single battery.
16. The sampling method of claim 15, wherein the step of determining a current actual voltage of a next cell adjacent to the first cell comprises:
determining the current actual voltage of the next single battery adjacent to the first single battery by using a fourth preset formula;
wherein the fourth preset formula is:
U2＝-R1*U1/(Rb+2R1)-[(R1+2R2+Rd)+(Rb+R1)*R1/(Rb+2R1)]*Ud4/Rd，U2is the current actual voltage, U, of the next cell adjacent to the first celld4Is the fourth sampled voltage.
17. An electronic device, comprising:
the battery system comprises a plurality of sampling units, a plurality of equalizing units, a plurality of single batteries and a sampling chip; and
processor for performing the steps of the sampling method of a battery system according to any of claims 8 to 16.
18. A readable storage medium storing computer instructions, which, when run on an electronic device, cause the electronic device to perform the steps of the method for sampling a battery system according to any one of claims 8 to 16.
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| CN113632289A (en) | 2021-11-09 |
| WO2022016427A1 (en) | 2022-01-27 |
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